1,1
Note that each term is a multiple of the preceding term (at least up to a(5)).
K. S. Brown, Numbers Expressible as (a^2-1)(b^2-1)
K. S. Brown, MathPages Most Wanted List Problem #14
a(4)=241920 since 241920 =(4^2-1)(127^2-1) =(7^2-1)(71^2-1) =(9^2-1)(55^2-1) =(17^2-1)(29^2-1)
Cf. A057535, A063066, A063067.
Sequence in context: A203745 A012812 A119756 * A130558 A132593 A162133
Adjacent sequences: A063065 A063066 A063067 * A063069 A063070 A063071
more,nonn
Henry Bottomley (se16(AT)btinternet.com), Jul 08 2001
